Geochemistry of zircons from the proterozoic weathering profile of granitoids in Northern Karelia

Alfimova, N. A.; Matrenichev, V. A.; Zinger, T. F.; Скублов, С. Г.

doi:10.1134/s1028334x11050011

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…In felsic rocks such as granitic rocks, the strong minerals are not soluble in intense weathering. An example of such a mineral is zircon, which will be preserved under extreme weathering conditions (Alfimova et al 2011). The Kuantan granites also contain zircons as the main accessory phase.…”

Section: Resultsmentioning

confidence: 99%

“…Most zircons are transparent, colourless to pale brown and show oscillatory zoning indicative of magmatic growth. Thus, the retention of zircon in the weathering product (Alfimova et al 2011) of the granitic rocks will increase the Ce content in the residual soil. Ce 4+ is compatible in zircon because it has the same charge and a similar ionic radius to Zr 4+ (Ce 4+ = 0.97 Å; Zr 4+ = 0.84 Å) (Thomas et al 2003).…”

Section: Resultsmentioning

confidence: 99%

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Ce Anomaly in I-Type Granitic Soil from Kuantan, Peninsular Malaysia: Retention of Zircon in the Weathering Product

Ghani¹,

Shahjamal²,

Ng³

et al. 2019

JSM

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This paper describes the Ce anomaly observed in granitic soil from the humid, tropical area of Kuantan, Pahang, Peninsular Malaysia. Three granite rock soil profiles from Kuantan, were sampled and all samples were analysed for rare earth elements. All the profiles of the granitic soil samples show prominent positive Ce anomalies, with the Ce/Ce* ratio values (Ce/Ce*= CeN/√LaN.PrN) ranging from 1.2 to 125. l. Ce 4+ is compatible in zircon because it has also the same charge and a similar ionic radius as to Zr 4+ (Ce 4+ = 0.97 Å; Zr 4+ = 0.84 Å). The retention of zircon in the weathering product of the granitic rocks will increase the Ce content in the soil. Thus it is likely that the positive Ce anomaly in the REE profile of the Kuantan Granites may also have resulted from retention of zircon in the weathering product.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Ce Anomaly in I-Type Granitic Soil from Kuantan, Peninsular Malaysia: Retention of Zircon in the Weathering Product

Ghani¹,

Shahjamal²,

Ng³

et al. 2019

JSM

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“…When recrystallization of zircon takes place in fluid-enriched conditions, very unusual inner structures are formed, which are affecting primary growth zoning. These are complex, curved, and spongy structures with inclusions of surrounding rock-forming minerals (Kaulina, 2010;Skublov et al, 2010;Alfimova et al, 2011). These secondary zones in zircons are usually different from the primary ones by darker BSE or lighter in CL images and greater changes in chemical compositional enrichment with a broad range of non-formula elements.…”

Section: Zircon Morphologymentioning

confidence: 99%

U–Pb geochronology, REE and trace element geochemistry of zircon from El Fereyid monzogranite, south Eastern Desert, Egypt

Скублов

Gawad

Левашова

et al. 2021

Journal of Mineralogical and Petrological Sciences

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The monzogranite of El Fereyid is one of the rare metal-rich granites, where zircon is one of the ore minerals. Thus, studying zircon here is of vital importance. Most of the studied zircon grains are metamict and thus the loss of radiogenic Pb is detected for them. Nevertheless, our study allowed us to obtain the U-Pb (SHRIMP-II) age of magmatic crystallization for the El Fereyid monzogranite: 626 ± 13 Ma. These data allowed the correction of earlier determined age (K-Ar system in biotite) for the El Fereyid massif.Zircon grains of El Fereyid monzogranite demonstrate heterogeneous structure in CL images, they are rich in rare earth elements (REE, concentration 3000-22500 ppm), trace elements (U: 2000-14800 ppm, Th: 300-2500 ppm), and has low Th/U ratios (average 0.18). Most zircon grains exhibit multiple internal oscillatory zoning in CL images, indicating a typical magmatic origin. The core of zircon grain has a dark tone on CL imaging and magmatic-type REE spectra. Zircon cores are enriched in REEs, U, Th, and Y, thus recording that the magma was rich in incompatible elements. Light CL rims of zircon grains are depleted, relative to the cores in most of the trace elements, except for P, Ca, and Ti. REE spectra in rims show similar patterns that are more often demonstrated by hydrothermal zircon grains. This explains their crystallization in the late-magmatic stage when magma was rich in fluids but depleted in most of the trace elements.

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Geochemistry of zircons from the proterozoic weathering profile of granitoids in Northern Karelia

Cited by 2 publications

References 4 publications

Ce Anomaly in I-Type Granitic Soil from Kuantan, Peninsular Malaysia: Retention of Zircon in the Weathering Product

Ce Anomaly in I-Type Granitic Soil from Kuantan, Peninsular Malaysia: Retention of Zircon in the Weathering Product

U–Pb geochronology, REE and trace element geochemistry of zircon from El Fereyid monzogranite, south Eastern Desert, Egypt

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